1Graham, Gerald H. , Understanding Human Relations: The Individual, Organization, and Management , SRA Publishing Company. May 1982.
2Herzberg: Frederick. Herzberg on Motivation, Penton Education Division. December 1991.
3Gawel, Joseph E. , Herzberg's Theory of Motivation and Maslow's Hierarchy of Needs, ERIC Clearinghouse on Assessment and Evaluation Washington DC. , 1997.7
4Allen F. Wysocki, Karl W. Kepner, and Michelle W. Glasser,Associates and Motivation,EDIS. May 2001
